Precession-type backfill grouting ground source thermal energy conversion precast pile device and method for embedding precast pile device into stratum

Abstract

The invention discloses a precession-type backfill grouting ground source thermal energy conversion precast pile device, which comprises a plurality of precession-type backfill grouting prefabricated screw piles respectively embedded into pile holes, wherein a vertical heat exchanger is embedded in each screw pile; the inlet end and the outlet end of each vertical heat exchanger respectively extend out of an opening at the upper end of the screw pile to be respectively connected with a horizontal liquid-feeding collecting pipe and a horizontal liquid outlet collecting pipe in a bearing platform or a cushion layer; centring brackets are arranged at an interval of 1-3 m along the length direction of each vertical heat exchanger; each precession-type backfill grouting prefabricated screw pile comprises a hollow pile core, wherein the bottom of the pile core is provided with a cone-shaped pile head; a screw blade is arranged on the position far away1-3m from the lower part of the outer wall of the pile core; and a post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and a pile hole wall. The precession-type backfill grouting ground source thermal energy conversion precast pile device comprises a plurality of precession-type backfill grouting prefabricated screw piles, and the vertical heat exchanger is embedded in each screw pile; the pile foundation construction and the ground source heat pump construction are integrated so as to avoid a drilling and pipe-laying program of a ground source heat pump system on the ground, greatly lower the front-end investment cost and save the land use area; and the post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and the pile hole wall so as to enlarge a heat conduction area, improve the heat conduction performance and simultaneously improve the pile body bearing capacity.

Description

technical field [0001] The invention relates to the technical field of ground source thermal energy prefabricated piles, and in particular relates to a precession type wall grouting ground source thermal energy conversion prefabricated pile device and a method for burying it in strata. Background technique [0002] Ground source heat pumps can provide ground source heat energy to buildings, which is an environmentally friendly and energy-saving way. The heat pipe method converts the underground heat energy to the ground, and the cost of pre-drilling is very high, generally accounting for more than half of the total investment, and the process of burying heat exchange tubes in the drilling is very complicated. This has caused difficulties in the development of ground source heat pump technology. Pile foundation is a commonly used foundation form for buildings. Usually, the diameter of the pile is from 0.5 to 2.0 m, the length of the pile is ten meters, or even up to 100 mete...

AI Technical Summary

Problems solved by technology

[0002] Ground source heat pumps can provide ground source heat energy to buildings. This environmentally friendly and energy-saving method is being widely used. The way of heat pipe is to convert underground heat energy to the ground, but the cost of pre-drilling is very high, generally accounting for more than half of the total investment, and the process of embedding heat exchange tubes in boreholes is very complicated

This has caused difficulties for the development of ground source heat pump technology.

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